A 010 M Solution of a Weak Monoprotic Acid Has a a Hydronium-Ion

question 19

Multiple Choice

A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.6 $\times$ 10^-4 M.What is the acid-ionization constant,K_a,for this acid?

• A) 2.1 \(\times\) 10^-2
• B) 3.2 \(\times\) 10^-3
• C) 4.6 \(\times\) 10^-4
• D) 2.1 \(\times\) 10^-6
• E) 5.5 \(\times\) 10^-5

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